I also program a System Off page in a "Confirm" device
on my remotes. The "Yes" and "No" buttons work as described
above, and I add four dummy buttons to create a message,
looking like this:

TURN
SYSTEM
OFF?

NO
YES

Also as Andrew described, my "No" button performs a Navigate-
command to get you back to where you came from.

But I also add an additional feature: only on the
System Off page, the "Off" hard button is aliased to the
"Yes" button. This way, when I'm walking out the door,
I reach up and double-press the "Off" button to shut the
theater down and turn off the lights. I don't even have
to look at the screen of the remote.

Granted, I suppose you COULD double-press the "Off" button
when you're meaning to press a different key, but it's
never happened in my house, even with my six-year-old
twins.

Best regards,
Dale